Materials and products for the construction, maintenance, repair and renovation of buildings, work of art, roads and other travel and circulation tracks and surfaces and for all public works, namely, building materials in the nature of fly ash, cements, namely, silica fume cements, blast furnace cements, white portland cement, drilling cements, aluminous cements, fibre-reinforced cements, mortars, plasters, concretes, sands, fine gravel, gravels, sand and gravel mixtures, dry stone revetments...